JPS61170930A - Record carrier body, structural body former, information recorder and reader and record carrier - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The invention relates to a record carrier body on which a user can record information by means of optical radiation, comprising a substrate and a recording layer on the substrate, and a preformed and optically detectable relief. A servo track portion of the structure and a sector address are arranged, the sector address containing address information regarding the associated recordable portion of the record carrier body in the form of optically detectable areas alternating with intermediate areas; The present invention relates to a record carrier body in which the optically detectable area has a different phase depth than the servo track portion. The invention also relates to a device for recording the structure according to the relief structure of the sector address and servo track portion of the record carrier body.

The record carrier body may be a circular plate-like substrate with a recording layer capable of producing an optically detectable change by a radiation beam of sufficiently high intensity.

The servo track portion may include a groove recessed in the substrate surface or a raised portion formed on the substrate surface, and the sector address area may include a pit recessed in the substrate surface or a hill portion formed on this surface. You can get it. The sector addresses can be arranged between successive servo track sections in the track direction to form one composite track. This track extends over the entire surface area of the recording layer and is preferably a group of tracks, but alternatively it may comprise a number of concentric tracks.

When the sector address and servo track portions are exposed to a focused radiation beam to form a small radiation spot, this beam is split into a zero order sub-beam, a first order sub-beam and a higher order sub-beam. As used herein, the term “
"Phase depth" means the phase difference between the zero order sub-beam and the first order sub-beam.

This phase depth depends on the geometry of the sector address areas and servo track portions, in particular the depth or height of these areas and track portions.

Such a record carrier body is particularly described in US Pat. No. 4.363.1.
It is known from No. 16. As described in this US patent, the servo track section is used by a user to detect and modify the radial position of a radiation spot formed on a recording layer by a radiation beam in recording information. Ru.

In this way, the requirements placed on the drive and guide mechanism for moving the writing spot and the record carrier body relative to each other can be relaxed, making the writing device simpler and cheaper. be able to.

Preferably, the radial position of the radiation spot relative to the servo track position is detected by a "push-pull" or differential method. In this method, two radiation-sensitive detectors are used, which are The device is arranged in the path of the radiation beam coming from the record carrier body so that it receives different radial portions of this beam.

The difference between the output signals of these two detectors contains information about the radial position of the radiation spot relative to the servo track section. If the output signals are equal, the center of the radiation spot coincides with the central axis of the servo track section. Differential tracking can only be used if the servo grooves or servo ridges have a depth or height such that the phase depth is on the order of 90°.

The sector address area is the central aperture (Ce).
ntral-Aperture)” or inchgra/
It is read using the lz (inte-gral) reading method. In this method, the variation in the total intensity of the radiation originating from the record carrier body and passing through the objective is detected by a single detector arranged on the optical axis, or by two detectors used for tracking and whose output signals are added to each other. Detected by a detector. For optimal reading of a sector address the area in it is approximately 1
It is necessary to have a phase depth of 80°.

It has been found that, in addition to the phase depth, the width of the servo track portion and the sector address area, measured in a direction transverse to the track direction, also has a significant influence on the amplitude of the signal obtained when recording user information. Half intensity value (
In the record carrier body according to said US Pat. No. 4,363,116, f which is scanned by a radiation spot having a half intensity value of approximately 800 nm, the servo track portion and the sector address area have a width of approximately 6000 m; The period of the track structure in the direction transverse to the track direction is approximately 1600 nm. The half-intensity diameter of a radiation spot is equal to the distance between two points where the intensity is half the intensity at the center of the radiation spot.

Tracking signals with moderately different signal amplitudes can be obtained with known record carrier bodies.

It is an object of the invention to provide a record carrier body which generates a differential tracking signal with a significantly large signal amplitude when scanned for the purpose of recording information. Another object of the invention is to provide an improved information signal with a large signal amplitude when reading an information area recorded by a user according to an integral reading method.

Therefore, the record carrier main body of the present invention is characterized in that the maximum width of the servo track portion is at least 60% of the track period across the track direction, and at least twice the maximum width of the sector address area. .

The use of the term "maximum width" does not require that the servo grooves or ridges and sector address pits or hills have vertical walls, but in practice they usually have sloping walls. In this case, the maximum width is the width at a location on the surface of the recording layer opposite to the substrate. Apart from the maximum width, the servo grooves and sector address pits also have an effective width. Shallow servo grooves generally have a V-shaped cross section. For such groove shapes, the effective geometric width is approximately half of the maximum width. Deeper pits at sector addresses are often trapezoidal. For such pits, the effective width shall be equal to half the sum of the maximum and minimum widths.

In the present invention, the effective width of the servo track section needs to be approximately half the track period for the maximum amplitude of the differential tracking signal, and on the other hand, for the maximum amplitude of the integral read signal generated by the sector address area. This was done based on the knowledge that the effective width of these areas needs to be about 1/3 of the track period. The present invention does not use the method currently used in the manufacture of mask disks for such record carrier bodies, in which both sector addresses and phototracks are recorded by one radiation spot, but instead uses Since two radiation spots are used, the sector address area and the servo track portion can each have different optimum widths.

Furthermore, European Patent Application No. 0.100.995 describes a record carrier body provided with servo track portions in the form of grooves and sector addresses in the form of pits. The European patent application discloses that the width of the servo groove can be made equal to the width of the pit at the sector address.

However, the European patent application discloses that if the sector address pit has a depth of λ/4, which corresponds to a phase depth of 180° for a pit with straight walls, satisfactory tracking by the differential method is achieved at the location of the sector address. It deals with the problem that is impossible. Here λ
is the wavelength of the radiation beam used to read addresses and record user information. To solve this problem, the sector address pits should have the same depth as the servo grooves, that is, about 90 mm for pits with straight walls.
It is proposed to give a phase depth of °. Therefore, in this record carrier body, the phase depths of pits and grooves are not different as in the record carrier body according to the invention. More importantly, the ratio between the width of the servo track section and the sector address area in the record carrier body according to said European patent application is different from that in the record carrier body according to the present application.

In the European patent application, the width is defined as the half intensity width (h) of the scanning spot.
alf-intensity width))Wo. The servo groove is W. /2 width,
And the sector address pit is W. /3, the width of the servo groove is about 1.5 times the width of the pit.

In a preferred embodiment of a record carrier body according to the invention for scanning by a radiation spot with a half intensity width of approximately 800 nm, the width of the servo track portion is approximately 1200 nm.

11] '33/2. W. yo6, e −/ ) cD[(
t#600nm, jlI] '3'3/
4.W. Furthermore, the European patent application does not say anything about the relationship between maximum track width and track period.

The record carrier body of the invention also uses two radiation spots, each recording a servo track portion and a sector address, in order to increase the signal obtained when the information recorded by the user is later read. Therefore, the record carrier main body of the present invention is characterized in that the servo track portion constitutes a continuous track, and the sector addresses are arranged between servo tracks adjacent to each other in a direction transverse to the track direction.

In this record carrier body, the user does not record information on the servo track portions, as is conventionally done, but on the land (1and) portions between the servo tracks, that is, on the flat portions of the recording layer. As a result, the information area including the melted and removed portion of the recording layer is
It can be detected better than when it is placed in the servo groove.

Furthermore, the present invention relates to a structure forming device for forming structures of sector addresses and servo track portions on the photosensitive layer of a mask disk, and the present invention relates to a radiation source device that generates two radiation beams, and A separate intensity modulator and two beams of different dimensions are used to focus the two radiation beams.
and an objective system forming two radiation spots, configured such that the smaller radiation spot is used for recording sector addresses and the larger radiation spot is used for recording servo track sections. It is characterized by what it did.

Note that the use of two radiation spots to simultaneously record information areas and servo tracks is disclosed in US Patent No. 4.
027.330.

However, this US patent uses a wider radiation spot to record a wider information area and a narrower radiation spot to record a narrower servo track. . the information area has the form of a locally widened section of the servo track and is distributed over the entire length of the servo track;
Therefore, it does not constitute a sector address area.

Furthermore, the structure forming apparatus of the present invention is characterized in that the two radiation spots are located at the same position when viewed in a direction transverse to the longitudinal direction of the servo track section to be recorded.

However, it is preferable that the structure forming apparatus of the present invention is configured such that the two radiation spots are shifted relative to each other when viewed in a direction transverse to the longitudinal direction of the servo track portion to be recorded.

In that case, the sector address is recorded on a land between the rotating parts of the servo track. Next, user information is also recorded on these lands, so that the information area can be read more effectively by the integral reading method.

In order to read sector addresses in a record carrier body having consecutive servo tracks and sector addresses arranged between these tracks and to record information on this record carrier body the user has to use a recording and reading device modified according to the invention. There is. Accordingly, the present invention provides a radiation source device that generates a single or double writing/reading beam, an intensity modulator disposed in the path of the beam, and a radiation source that concentrates the beam for single or double writing/reading. In the information recording and reading apparatus, an auxiliary beam for tracking is provided, and the auxiliary beam is focused by the objective system to produce a single or It is characterized in that, for the double write/read spot, an auxiliary radiation spot is formed which extends in a direction transverse to the track direction over a distance equal to half the track period.

After the user records information on the record carrier body of the preferred embodiment of the present invention, the sector addresses are arranged between consecutive servo tracks, and the information area is configured to be recorded between successive sector addresses when viewed from the right in the track direction. A record carrier body is obtained which is characterized by the following.

The invention will now be described in detail with reference to the drawings.

The record carrier body 1 shown in FIG. 1 comprises tracks 10, for example L-group tracks, of which only two turns are shown in FIG. Each circuit of the trough I is divided into a number of sectors 11, for example 64 or 128. Each sector comprises a servo track portion 13 and a sector address 12, in which information can be recorded by the user, and in which the sector address particularly includes the address of the associated servo track portion 13 as shown in FIG. It is stored in the form of a digital code by an optically readable area 15, as shown in FIG. Since both the optically readable area and the servo track section 13 can be detected optically, the desired address can be detected before the information block is recorded, and the writing spot can be detected both before and during recording. Measures can be taken to ensure that the servo tracks accurately follow the servo tracks. The record carrier body l has a recording layer which produces an optically detectable change when exposed to radiation of sufficiently high intensity.

It should be noted that the method and device for reading the address and following the servo track section when recording information by the user, as well as the manner in which the recorded user information is read, are outside the scope of the present invention, and therefore will not be described here. These matters are described in the aforementioned US Pat. No. 4,363,116.

FIG. 2 shows portions of two radially adjacent sectors of track 10. In FIG. As shown in this figure, the sector address consists of optically readable areas 15 alternating with intermediate areas 16 in the track direction. A land portion 14 is disposed between successive circuits of the track 10 at the same height as the intermediate region 16 . The servo track portions may include ridges disposed on the surfaces of intermediate region 16 and land portions 14, or grooves recessed into these surfaces as shown in FIG. In the latter case, the sector address area comprises pits on said surface, which pits are deeper than the servo grooves, as is clear from FIG.

For clarity of explanation, track 10 in FIG.
The width of the land portion 14 is exaggerated compared to the total surface area of the record carrier. In practice, the main body of the record carrier may be, for example, about 30
cm and the radial period Pr s, ie the period of the track structure in the radial direction r, is, for example, 160 cm.
It is 0 nm. Furthermore, the length of the sector address is also exaggerated compared to the servo track section 13. In reality, the length of the servo track section is, for example, about 10 to 100 times the length of the sector address 12.

FIG. 3 shows a radial cross-section of a part of the record carrier body along the line 3--3' of FIG. 1 at a location where only the servo track section 13 is arranged.

The servo track section 13 has grooves recessed on the surface of the land section 14, and can be tracked by the differential method. As described in GB 2.034.097, these grooves have a phase depth of the order of 90°. These grooves are shallow and their walls are 8
It has a large inclination angle θ of about 0°. Substrate 17 comprises a thin recording layer 18 . This recording layer can be, for example, a reflective layer containing bismuth or tellurium as its main element. The track structure is then projected from below as indicated by arrow 19 and scanned with a beam across the substrate.

Furthermore, a protective coating 20 can be provided on the recording layer 18.

FIG. 4 shows a part of the record carrier main body at a location where sector addresses are arranged as a sectional view taken along the line 4-4' in FIG. It is assumed that two optically readable regions 15 are arranged adjacent to each other in the radial direction at the point shown in the cross section.

As is clear from a comparison with FIG. 3, these optically readable areas are deeper than the servo track section, while the inclination angle
2 is, for example, about 30° to 60°.

FIG. 5 is a tangential cross-sectional view of a portion of the record carrier body taken along line 5-5' in FIG. As shown in FIG. 5, each sector address includes an address section 12a and a synchronization section 12b, each of which includes a plurality of uniformly sized pits recessed in the substrate. A pit string in the address section 12a indicates address information. The pits in the synchronizer 12b have a constant spatial frequency, and upon reading these pits e.g. contain a clock signal that controls the clock frequency of a signal source that modulates the amplitude of the writing beam used by the user to record information. occurs・

- With a writing beam whose intensity is modulated according to the user information to be recorded, pits 22 can be formed, for example by melting the recording layer at the track portion 130, and thus have a different reflection coefficient than the surrounding area; An information area is formed. After the information has been recorded, the user will have a record carrier in which the servo track portion 13 and the sector address 12 constitute a phase structure, while the user information is recorded, for example, in the form of an amplitude structure.

In the present invention, as is clear from FIG. 1 and a comparison between FIGS. 3 and 4, the maximum width W +a of the servo track portion
Let ax1 be at least twice the maximum width W,□,2 of the sector address area, and W aai,1 be larger than half the track period (P,) in the radial direction. P,・
1600 nm, and the half intensity value is approximately 8001
For a record carrier scanned with a radiation spot of m, W+aax, l is approximately 12001 m, and 9
4□, 2 is about 600 nm. Increasing the width of the servo track section results in a differential tracking signal with a maximum track width equal to the maximum width of the sector address area, e.g. 600 nm, which results in a better signal amplitude than the tracking signals obtained from hitherto known record carrier bodies. It comes to have. Furthermore, an important advantage is that the servo track section 13
For a particular width, the information areas 22 recorded by the user on these servo track sections 13 can be better read by the integral reading method on such servo track sections 13 having a smaller width.

This means that if the width of the servo track groove 13 is wider and more similar to the flat part of the recording layer, the information area 22 having a different reflection coefficient than its surrounding area can be detected better. It can be explained from

The optimal value of the maximum track width for differential tracking and for reading by the integral reading method from the sector address area arranged according to the present invention was determined by the inventor after careful examination of the results obtained by vector diffraction calculations. This is what I got from doing it. This is because the amplitude of the second order and higher-order diffraction orders decreases as the width of the servo track section increases, and the volume of the servo track groove or ridge increases even more if the track width is kept the same. As a result of the increased amplitude of the primary sub-beam, and as the maximum track width more closely approximates the radial period of the track structure, the phase depth is reduced to an optimum of 90° even for deeper depths of the servo track. Indicates that the value is closer to the value. It has been found that the specific value for the maximum track width can be specified to a value greater than or equal to the value at which the amplitude of the differential tracking signal hardly increases. For a record carrier body scanned with a radiation spot having a period P1 of the order of 1600 nm and a half intensity value of approximately 800 nm, said value is approximately 1200 nm.

Vector diffraction theory teaches that the differential tracking signal is ideal for an effective track width equal to approximately half the radial track period.

For letter-shaped servo grooves, this means that the maximum groove width is approximately equal to the track period, so that the grooves are adjacent to each other. This is undesirable from a manufacturing technology standpoint. However, it has also been found that a sufficiently acceptable tracking signal can be obtained for deviations of about 25% from the ideal track width. Therefore, in a specific embodiment of the record carrier body according to the invention, the optimum value for the maximum width of the servo track portion is approximately 75% of the radial track period. A deviation of about 20% from this optimum value is acceptable.

FIG. 6 shows a preferred embodiment of a record carrier body according to the invention. In this example, the servo track portions are tangentially adjacent to each other and form continuous family tracks or continuous concentric tracks 13. The sector address 12 is arranged between the rotating parts of the servo track 13. The optimum value for the maximum width of the servo track 13 is also of the order of 75% of the radial period P, and the maximum track width is also at least twice the maximum width of the sector address area.

FIG. 7 is a radial sectional view of a portion of this record carrier body taken along the line 7--7' of FIG. 6 at the location where the sector addresses are arranged. It is assumed that two optically readable areas 15 are adjacent to each other in the radial direction at a location having this cross section. FIG. 7 is self-explanatory with reference to the description of the first embodiment according to FIGS. 3 and 4. FIG. 8 is a tangential cross-sectional view of a portion of the record carrier body taken along line 8-8' in FIG. This figure is also similar to FIG. 5, so the explanation will be omitted.

In the record carrier body shown in FIG. 6, the information area 22 includes two servo track sections 13 and two sector addresses 1.
is recorded by the user in the land between 2 and 2.

Since the surface for recording the information area is completely flat,
These information areas can be read much better by the integral reading method than if the information were recorded in the wide servo track section of the record carrier body l shown in FIG.

The recording of user information between the narrow servo grooves or ridges does not need to be combined with wider servo grooves and can be applied to record carrier bodies with narrower servo grooves. Recording the information areas between the servo grooves or ridges then also has the advantage that these information areas can be read more effectively.

FIG. 9 shows the basic structure of an apparatus capable of generating sector addresses and servo track sections on a mask disk. In this figure, reference numeral 30 designates the substrate of the mask disk, for example a glass substrate. This substrate has photosensitive layer 3
1, the thickness of which is suitably selected so that the sector address area formed after development of the photosensitive layer is matched to the wavelength of the beam in order to scan the record carrier body in order to obtain the correct phase depth. the depth or height. The radiation source device 33 may comprise one laser or two separate lasers 34 and 35, for example an argon-ion laser. This radiation source device generates two radiation beams b1 and b2, radiation beam b1 is operative to record a sector address and radiation beam b2
operates to record the servo track section. Narrow beams, e.g. Len, (36, 37 and 39.40
In this case, the beam b1 is widened by one round more than the beam b2. Therefore, the beam b1 has a width that fills most of the artificial pupil of the objective system 45. After traveling through the telescope section, the beam b2 passes through a mirror 42 and, for example, a beam splitting mirror 43.
is coupled into the path of beam b1 via a beam splitter in the form of .

The two beams are reflected by mirror 44 to objective 45, which focuses each beam to form radiation spots v and v2, respectively. beam b.

fills most of the pupil of the objective, so the beam is focused into the smallest diffraction-limited radiation spora). Beam b2, which fills a small portion of the pupil of the objective, is focused to form a larger radiation spot v2.

By rotating the disk about axis 32, spots v1 and v2 go around the disk. In order to record a family of tracks or a plurality of concentric tracks, the radiation spot and the disk must be moved relative to each other in the radial direction at a constant speed or in a stepwise manner. For this purpose, the mirror 44 and the objective 45 can be housed in a housing which moves in the direction indicated by the arrow 46.

Modulators 47 and 49, e.g. acousto-optical modulators, are arranged in the path of the beams b and b2 to provide the associated beam intensities to the modulation input terminals 48.48' and 50.50', respectively. Switch accordingly. When recording sector addresses, the modulator 47 is switched between high and zero levels at a high frequency.

Then, in this example device, modulator 47 is set to zero level. When recording the servo track portion, the modulator 47 is set to zero level, and the modulator 49 is continuously operated at an intermediate level.

Spot exposure locally increases the solubility of the photosensitive layer. A desired glue leaf pattern can be obtained by selectively removing the exposed photosensitive material during the development process. The depth and width of the servo groove are determined by the intensity of beam b2 and the width of radiation spot v2, respectively. After the mask disk has been developed, it can, for example, be coated with a silver layer. This disc is then used in a known manner to produce a matrix, which is used in the mass production of replicated discs.

The principal rays of beams b1 and b2 are arranged in the same X-Y plane.
♂, assuming that the mirrors 42 and 43 are arranged at an angle of 45° to the principal ray, the radiation spots v1 and v2 will be superimposed as shown on the right side of FIG. be done. Alternatively, the radiation spot can be shifted in the tangential direction of the disk, ie in the Y direction of FIG. 9, so that the radiation spoiler (V+) is located in front. For this purpose, the paths of beams b1 and b2 are
There needs to be a slight transition from one another in the direction.

In principle, a device similar to that shown in FIG. 9 can be used to record consecutive servo track and sector addresses during a revolution of a servo track; During address recording, modulator 49 is always at an intermediate level and modulator 47 is switched at a high frequency between high and zero levels.

The radial displacement of the radiation spots v1 and v2 with respect to each other may, for example, cause the mirror 42 to move into the beam b2, as shown in FIG.
This can be achieved by arranging the lens at a slightly more specific angle than 45° with respect to the chief ray of the lens. FIG. 10 shows only that part of the path where the beam is given different directions, ie starting at mirror 42.

9 and 10 show the basic configuration of an apparatus for recording sector addresses and servo track sections, and this apparatus can be modified in various ways. For example, the radiation source arrangement may include only one laser, followed by a beam splitter. To minimize loss of intensity, this beam splitter and the beam splitter 43 are preferably polarization-dependent beam splitters, and a single or double radiation source splits two beams polarized perpendicularly to each other. It is necessary to allow it to occur. Wavelength selective beam splitters can also be used with single or dual radiation sources that emit beams of two different wavelengths. The evolution of the radiation spora) V+ and v2 in the radial direction, that is, in the X direction in FIG.
This can also be achieved with an optical wedge in 20 channels, in which case the mirror 42 extends parallel to the beam splitter 43.

It is necessary for the user of the record carrier body to have at his disposal recording and reading equipment for recording information and for reading this information and for reading sector addresses both during recording and during reading of information. It is. Such recording and reading devices are described, for example, in the aforementioned U.S. Pat. No. 4.36.
3.116 and British Patent No. 2.097.150
It is known from the specification of No.

The known recording and reading device is suitable for use with a record carrier body in which the sector address occupies the same radial position as the associated servo track portion.

For record carrier bodies in which the servo track portions constitute continuous tracks and the sector addresses are arranged between the circumferential portions of the servo tracks, the tracking device in the known recording and reading apparatus is modified to form scanning tracks and deep tracks. and British Patent No. 2 for record carriers with shallow tracks.
．． It can be maintained at a constant distance from the servo track in a manner similar to that described in 013.489. Known recording and reading devices can also be provided with means for forming additional radiation spots for tracking.

FIG. 11 shows an example of such a recording and reading device.

This figure shows only the elements of the tracking device. Element 60 is a radiation source, for example a diode laser, producing beam b3. Lenses 61 and 62 constitute a beam widening telescope section that allows beam b3 to properly enter the pupil section of objective system 67. Instead of this telescope part,
A lens placed between mirror 65 and objective 67 can also be used. The beam reaches this objective after being reflected from mirror 63, beam splitting mirror 64 and mirror 65. The objective system focuses the beam b3 onto a diffraction-limited radiation spot v on the recording layer 18 of the record carrier body 1.
form 3.

This record carrier body can be rotated about an axis 68 and the mirror 65 and the objective 67 together sweep radially relative to the record carrier body, i.e. in the X direction in FIG. 11 as indicated by arrow 75. You can move by wiping it.

The mirror 63 and the beam splitting mirror 65 split the auxiliary beam b,
into the main radiation path so that all beams pass through the same objective system. The main radiation path is a wide beam with double arrows bo, l (bo,
2) is shown diagrammatically. Block 69 is mirror 65
1 and objective system 67 form a known part of a recording and reading device. Only one radiation spot can be used for both recording and reading as described in the aforementioned US Pat. No. 4,363,116. The known part 69 then comprises a radiation source, for example a diode laser, a beam widening and collimating lens system,
It comprises a modulator, a radiation-sensitive detection device, and a beam splitter for directing radiation reflected by the record carrier body towards said detection device for generation of address and information signals by said detection device.

In another variant of the known part 69 two radiation beams b
. , 1 and s. .
2. The radiation spots V, , V2 and V have the same dimensions. In this example, the known portion 69 is reflected by, for example, two diode lasers, a beam splitter that recombines the two laser beams after one of the two laser beams has passed through a modulator, and a record carrier body. a second beam splitter for deflecting the beam, a third beam splitter for separating the two beams, and a separate detection device for each beam. radiation spot v,
beam b. , 1 is operative to read the clock signal and address and record information, and the beam b forming the radiation spot v2. , 2 are used to read the information. A more detailed description of known portions 69 capable of generating one or two radiation beams can be found in the aforementioned U.S. Pat. No. 4.363.116 and the aforementioned British Patent No. 2.
Since they are described in the specification of No. 097.150, their description will be omitted.

The auxiliary beam b3 is reflected by the record carrier body and returns to the beam splitter 70. This beam splitter reflects a part of beam b3 to a radiation-sensitive detection device comprising two detectors 71 and 72. The output signals of these detectors are supplied to a differential amplifier 73. The output signal Sr of this differential amplifier contains information regarding the magnitude and direction of the deviation between the center of the radiation spot v, and the central axis of the servo track. This signal is used to modify the radial position of radiation spot V3 and the radial position of radiation spots v1 and v2, e.g.
4 and this actuator moves the mirror in the direction of arrow 66.
By rotating in the direction shown, the radial position of the radiation spot is corrected.

[Brief explanation of drawings]

1 is a plan view showing a part of an embodiment of the record carrier main body of the present invention; FIG. 2 is an enlarged plan view showing two adjacent sector addresses of the record carrier main body of FIG. 1; The diagram is from 3 in Figure 1.
4 is an enlarged sectional view taken along line 4-4' of FIG. 1, FIG. 5 is an enlarged sectional view taken along line 5-5' of FIG. 1, and FIG. 6 is an enlarged sectional view taken along line 5-5' of FIG. 7 is an enlarged sectional view taken along the line 7-7' of FIG. 6, and FIG. 8 is an enlarged sectional view taken along the line 8-8' of FIG. 6. A sectional view, FIG. 9 is a route diagram showing a first embodiment of a structure forming apparatus for recording on a record carrier main body according to the present invention, and FIG. 10 is a route diagram of essential parts of a second embodiment of a structure forming apparatus according to the present invention. , FIG. 11 is a route map showing an embodiment of the information recording and reading device of the present invention. ■...Record carrier body 10...Track 11.
...Sector 12...Sector address 12
a...Address section 12b...Synchronization section 13...
- Servo track section 14... Land section 15... Optically readable area 16... Intermediate area 17... Substrate 18...
・Recording layer 20...Protective coating 22...Pit 30...Substrate 31...Photosensitive layer
32... Rotating shaft 33 of substrate 30... Radiation source device 34.35... Laser 36, 37.3
9.40...Lens 42...Mirror 43...Beam splitting mirror 44...Mirror 45...Objective system
47...Modulator 48, 48'...Modulation input terminal 49...Modulator 50, 50'...Modulation input terminal
-su,,b2...radiation beam V
,,V,...Radiation spot 60...Radiation source
61.62...Lens 63...Mirror
64... Beam splitting mirror 65... Mirror 66... Rotational movement direction of mirror 65 67... Objective system 68... Rotation axis 69 of record carrier body 1... Known portion 70... Beam splitter 71.72...Detector 73...Differential amplifier 74...Actuator bo, + (bo, 2), t++...Radiation beam V,, V2. V3...radiation spot FIG
) 5 Continued on page 1 Inventor Nicolas Cornelli Netherlands 5
621 Bass Josephus Ant 1 Nius van Hieiningen

Claims (1)

[Claims] 1. A record carrier body on which a user can record information by optical radiation, comprising a substrate and a recording layer on the substrate;
and is provided with a pre-formed and optically detectable relief structure servo track portion and a sector address, in which the address information relating to the associated recordable portion of the record carrier body is provided with an optical interleaved area alternating with the intermediate area. In a record carrier body in which the optically detectable area at the sector address has a different phase depth than the servo track part, the maximum width of the servo track part is at least 60 of the track period transverse to the track direction. % and at least twice the maximum width of a sector address area. 2. A record carrier body on which a user can record information by means of optical radiation, comprising a substrate and a recording layer on the substrate;
and is provided with a pre-formed and optically detectable relief structure servo track portion and a sector address, in which the address information relating to the associated recordable portion of the record carrier body is provided with an optical interleaved area alternating with the intermediate area. In a record carrier body in which the optically detectable area at the sector address has a different phase depth than the servo track part, the maximum width of the servo track part is at least 60 of the track period transverse to the track direction. % and at least twice the maximum width of the sector address area, the structure forming device forms a structure similar to that of the servo track portion and sector address of a record carrier main body, the structure forming device comprising: in a structure forming apparatus comprising: a radiation source apparatus for generating a radiation beam; a separate intensity modulator for each of the two radiation beams; and an objective system for focusing the two radiation beams to form two radiation spots of different dimensions. , a smaller radiation spot is used to record sector addresses,
A structure forming apparatus characterized in that the larger radiation spot is configured to be used for recording servo track portions. 3. The structure forming apparatus according to claim 2, wherein the two radiation spots are at the same position in a direction transverse to the longitudinal direction of the servo track portion to be recorded. 4. The structure forming apparatus according to claim 2, wherein the two radiation spots are shifted relative to each other when viewed in a direction transverse to the longitudinal direction of the servo track section to be recorded. 5. A record carrier body on which a user can record information by optical radiation, comprising a substrate and a recording layer on the substrate;
and is provided with a preformed and optically detectable relief structure of a two-track portion and a sector address, in which the address information regarding the associated recordable portion of the record carrier body alternates with the intermediate area. In a record carrier body comprised in the form of an optically detectable area and in which the optically detectable area at the sector address has a different phase depth than the servo track part, the servo track part constitutes a continuous track and the sector address is A record carrier body, characterized in that it is arranged between servo tracks adjacent to each other in a direction transverse to the track direction. 6. A record carrier body on which a user can record information by optical radiation, comprising a substrate and a recording layer on the substrate;
and is provided with a pre-formed and optically detectable relief structure servo track portion and a sector address, in which the address information relating to the associated recordable portion of the record carrier body is provided with an optical interleaved area alternating with the intermediate area. In a record carrier body in which the optically detectable area at the sector address has a different phase depth than the servo track part, the servo track part constitutes a continuous track and the sector address is A structure forming device for forming a structure similar to the structure of a servo track portion and a sector address of a record carrier body configured to be arranged between servo tracks arranged adjacent to each other in a direction transverse to the direction, the structure forming device A structure forming device comprising a radiation source device for generating, a separate intensity modulator for each of the two radiation beams, and an objective system for focusing the two radiation beams to form two radiation spots of different dimensions, A structure forming apparatus characterized in that a smaller radiation spot is used for recording sector addresses and a larger radiation spot is used for recording servo track portions. 7. The structure forming apparatus according to claim 6, wherein the two radiation spots are at the same position in a direction transverse to the longitudinal direction of the servo track section to be recorded. 8. The structure forming apparatus according to claim 6, wherein the two radiation spots are shifted relative to each other when viewed in a direction transverse to the longitudinal direction of the servo track section to be recorded. 9. A record carrier body on which a user can record information by optical radiation, comprising a substrate and a recording layer on the substrate;
and is provided with a pre-formed and optically detectable relief structure servo track portion and a sector address, in which the address information relating to the associated recordable portion of the record carrier body is provided with an optical interleaved area alternating with the intermediate area. In a record carrier body in which the optically detectable area at the sector address has a different phase depth than the servo track part, the servo track part constitutes a continuous track and the sector address is A single or dual write/read beam is used for recording information on and reading information from a record carrier body configured to be arranged between servo tracks arranged adjacent to each other in the transverse direction. An information recording and reading device comprising a radiation source device that generates radiation, an intensity modulator arranged in the path of said beam, and an objective system that focuses said beam to form a single or dual write/read spot. , an auxiliary beam for tracking is provided, and the auxiliary beam is focused by an objective to perform single or double writing/writing in a direction transverse to the direction of the servo track.
An information recording and reading device characterized in that it is configured to form an auxiliary radiation spot that moves over a distance equal to half the track period in a direction transverse to the track direction relative to the reading spot. 10. A record carrier body on which a user can record information by means of optical radiation, comprising a substrate and a recording layer on the substrate, and a pre-formed and optically detectable relief structure, two track portions and sector addresses. The sector address contains address information regarding the associated recordable part of the record carrier body in the form of an optically detectable area alternating with an intermediate area, and the optically detectable area at the sector address is In a record carrier body having a phase depth different from that of the track portion, the servo track portion constitutes a continuous track, and the sector address is arranged between servo tracks arranged adjacent to each other in a direction transverse to the track direction, In a record carrier body comprising a record carrier body on which information is recorded, sector addresses are arranged between consecutive servo tracks,
A record carrier body characterized in that an information area is configured to be recorded between successive sector addresses when viewed in the track direction.